New York-based MSCI will also add 10 more so-called A-share stocks to indexes, bringing the number of mainland-listed companies to 236, or 0.75 percent of the MSCI Emerging Markets Index's total, local news outlet Shanghai Securities News reported. The adjustment will take effect after the close of trading on Aug. 31.

MSCI said last year that it would include A-shares in two bourse trackers, MSCI Emerging Markets Index and the global MSCI ACWI. On May 15 this year, a first phase of 234 companies was added to the emerging markets gauge, after which eight were suspended, leaving a total of 226.